Poly (vinylidene fluoride) (PVDF) microporous film was successfully synthesized and functionalized by poly acrylic acid (PAA) for immobilization of nanoscale zero-valent iron (NZVI). PAA was innovatively introduced onto PVDF film via in situ polymerization of acrylic acid (AA) and followed by ion exchange procedure. The as-prepared PAA/PVDF-NZVI hybrids (PPN) were characterized in terms of morphology (SEM) and surface functional groups (FTIR). FTIR spectra confirms the functionalization of PVDF film by coating of PAA within its micropores. And SEM images suggested that NZVI were well immobilized onto the surface of the support. Over the reaction course, the resultant PPN hybrids demonstrated high reactivity, excellent stability and reusability for Cr(VI) removal. Results showed that lower pH and initial concentration facilitated the removal of Cr(VI) by PPN. Compared with bare NZVI, PAA/PVDF film-immobilized NZVI resulted in a lower activation energy for Cr(VI) removal, indicating that Cr(VI) reduction process with PPN is a surfacecontrolled chemical reaction. Moreover, a two-parameter pseudo-first-order model was provided and well-described the reaction kinetics of Cr(VI) over PPN under various conditions.

中文翻译：

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用于CR(VI)还原转化的具有阳离子交换功能的NZVI-PVDF混合薄膜的制备方法

聚（偏二氟乙烯）（PVDF）微孔薄膜成功合成并由聚丙烯酸（PAA）功能化，用于固定纳米级零价铁（NZVI）。通过丙烯酸 (AA) 的原位聚合和随后的离子交换程序，将 PAA 创新地引入到 PVDF 薄膜上。制备的 PAA/PVDF-NZVI 杂化物 (PPN) 在形态 (SEM) 和表面官能团 (FTIR) 方面进行表征。FTIR 光谱证实了 PVDF 膜通过在其微孔内涂覆 PAA 的功能化。SEM 图像表明 NZVI 很好地固定在载体表面上。在整个反应过程中，所得 PPN 杂化物表现出高反应性、优异的稳定性和去除 Cr(VI) 的可重复使用性。结果表明，较低的 pH 值和初始浓度有利于 PPN 去除 Cr(VI)。与裸 NZVI 相比，PAA/PVDF 膜固定的 NZVI 导致 Cr(VI) 去除的活化能较低，表明 PPN 的 Cr(VI) 还原过程是表面控制的化学反应。此外，提供了一个双参数伪一级模型，并很好地描述了 Cr(VI) 在各种条件下在 PPN 上的反应动力学。